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| How to calibrate Siglent SPD1000X / SPD3303X / SPD3303X-E series power supplies? |
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| Peter_O:
Did the FW upgrade to SPD3303X_V1.01.01.02.07R2_EN with an "upgraded" 3303X-E yesterday. At first glance the calibration stays well within specs. |
| oz2cpu:
some of you with a SPD3303 might find this video interesting ? https://youtu.be/BBW8dv2ImOc Noise ? or low frequency instability ? or just the regulation loop ? why is it not on a super cheap supply ? |
| tautech:
--- Quote from: oz2cpu on February 11, 2021, 09:49:13 pm ---some of you with a SPD3303 might find this video interesting ? https://youtu.be/BBW8dv2ImOc Noise ? or low frequency instability ? or just the regulation loop ? why is it not on a super cheap supply ? --- End quote --- Any AC ripple from the cheap SMPS is likely influenced by the 2V AC voltage accuracy spec of the SDM3055: 20 KHz – 50 KHz = +1.0% of reading + 0.05% of range P5 in the datasheet: https://int.siglent.com/upload_file/user/SDM3055/SDM3055_DataSheet_DS06035-E03E.pdf Whereas the SPD3303X is a linear PSU therefore any ripple is 2x mains frequency and measured result will be more accurate. Comparisons such as this need be done with a scope so to properly see the full noise/ripple picture. ;) |
| oz2cpu:
YES that is exactly what i would expect too, how ever the result is just the opposite, the SPD3303X is the one with more "jitter" but less noise |
| oz2cpu:
the SDM3055 voltmeter can reveal the odd stepped voltage signal from the SPD3303 so something is affecting the voltage in a special stepped way, however the levels of this is insanely low !! it is 50uV so there is now way to see this with a normal scope. just to verify my test setup, i connected the cheap MINLEAF NPS605W and saw the stepped surve is compleetly gone, by the way . WOW I am happy about the SDM3055 voltmeter |
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